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If you are leaving enough of any kind of oil in your firearm to damage primers you are leaving way too much oil. A little oil goes a long way. Of course I don't have the moisture problem where I live like some of you do. JMO

Proper use of a clean brass brush will never damage a firearm barrel - the bristles are much softer than the steel used, and the pressure is MUCH less than that caused by engraving the rifling of a bullet.

Never use a stainless steel brush!

Your cleaning rod is more of a hazard to the bore than is a cleaning brush - steel or jointed rods will obviously cause wear if they rub against the bore, and even soft aluminum rods can pick up grit and become abrasive. Use a bore guide and all will be well.

As for WD40 . . . when it dries out, it can leave a lacquer-like film, so I avoid using it as a long-term storage or lube on firearms. (Maybe it's the fish oil ingredient that's left behind once the volatiles evaporate.)

WildBill wrote:According to Wiki, WD40 was developed in 1953. That is much earlier than the Apollo fire. Maybe the fact that the inventor worked for Rocket Chemical Company contributed to this myth.

Anyway, TDDudes advice about brushing is right on. I think he's trying to say that you should push the brush all the way through the barrel.

Venus - Another important thing that is covered in the Box-O-Truth is that you put in the brush from the breech end so you don't damage the crown of the barrel with the cleaning rod.

You are correct. Snopes has it that way as well. I stand proudly corrected.

I was right about the water displacment and formula number though so I'm somewhat vindicated. :)

Anyway, it attracts dust like crazy so I keep it away from my guns.

To eliminate confusion, go out and get a "bore snake", call it a "bore cleaner" and be done with it. Follow the directions on the package the item now called "bore cleaner", formerly called "bore snake" came in and Mars will be good to go.